Robinson R66 Flashcards
Power Failure
(Above 500’ AGL)
- Lower collective immediately to maintain rotor RPM
- Establish a steady glide at approximately 70 KIAS
- Adjust collective to keep RPM between 95 and 106% or apply full down collective if light weight prevents attaining above 95%
- Select landing spot and, if altitude permits, maneuver so landing will be into wind
- A restart may be attempted at pilot’s discretion if sufficient time is available (>2,000 AGL)
- If unable to restart, turn unnecessary switches and fuel valve off
- At about 40 feet AGL, begin cyclic flare to reduce rate of descent and forward speed
- At about 8 feet AGL, apply forward cyclic to level ship and raise collective just before touchdown to cushion landing
- Touch down in level attitude with nose straight ahead
Air Restart Procedure
CAUTION
Do not attempt restart if engine malfunction is suspected or before safe autorotation is established.
An immediate restart may be attempted by pressing the start button if N1 is above 20% (within approximately 10 seconds of power loss). It is not necessary to close throttle or pull fuel cutoff for immediate restart.
If N1 has decayed to 20% or below, use the following procedure:
- Fuel cutoff - Pull OFF
- Throttle Closed
- Start button - Push and release
- N1 15% or above - push fuel cutoff ON
- After peak MGT- throttle full open
Maximum Glide Distance Configuration
- Airspeed approximately 90 KIAS.
- Rotor RPM approximately 90%.
Best glide ratio is about 5.5:1 or one nautical mile per 1100 feet AGL.
Minimum Rate of Descent Configuration
- Airspeed approximately 60 KIAS.
- Rotor RPM approximately 90%.
Minimum rate of descent is about 1300 feet per minute.
Glide ratio is about 4.5:1 or one nautical mile per 1350 feet AGL.
Power Failure
(Between 8’ and 500’ AGL)
- Lower collective immediately to maintain rotor RPM.
- Adjust collective to keep RPM between 95 and 106% or apply full down collective if light weight prevents attaining above 95%.
- Maintain airspeed until ground is approached, then begin cyclic flare to reduce rate of descent and forward speed.
- At about 8 feet AGL, apply forward cyclic to level ship and raise collective just before touchdown to cushion landing. Touch down in level attitude and nose straight ahead
Power Failure
(Below 8’ AGL)
- Apply right pedal as required to prevent yawing.
- Allow helicopter to settle.
- Raise collective just before touchdown to cushion landing
Emergency Water Landing Power Off
- Follow same procedures as for power failure over land until contacting water. If time permits, unlatch doors prior to water contact.
- Apply lateral cyclic when aircraft contacts water to stop rotors.
- Release seat belt and quickly clear aircraft when rotors stop.
Three Conditions Requiring Autorotation
Power Failure
Drivetrain Failure
Oil Pressure Failure
Tachometer Failure
If rotor or engine tachometer malfunctions in flight, use remaining tachometer to monitor RPM. If it is not clear which tachometer is malfunctioning or if both tachometers malfunction, allow governor to control RPM and land as soon as practical.
NOTE:
Each tachometer, the governor, and the low RPM horn are on separate power circuits. A special circuit allows the battery to supply power to the tachometers with the battery and alternator switches both off. (Low RPM horn and Governor are inoperative)
Land as Soon as Practical
Landing site is at pilot’s discretion based on nature of problem and available landing areas. Flight beyond nearest airport is not recommended.
Land Immediately
Land on the nearest clear area where a safe normal landing can be performed. Be prepared to enter autorotation during approach, if required
Low Rotor Horn
The horn activates simultaneously with the Low Rotor Caution Light and indicates rotor speed below 95% RPM. To restore RPM, immediately lower collective, verify throttle full open, in forward flight apply aft cyclic.
Horn and light are disabled when collective is full down.
Loss of Tail Rotor Thrust in Hover
Failure is usually indicated by nose right yaw which cannot be stopped by applying left pedal
- Immediately close throttle to control yaw rate and allow aircraft to settle
- Raise collective just before touchdown to cushion landing
Hydraulic System Failure
Hydraulic system failure is indicated by heavy or stiff cyclic and collective controls
Loss of hydraulic fluid may cause intermittent and/or vibrating feedback in the controls.
Control will be normal except for increase in stick forces
- HYD Switch - verify ON
- If hydraulics not restored, HYD switch - OFF
- Adjust airspeed and flight conditions as desired for comfortable control
- Land as soon as practical. A run-on landing is recommended if a suitable landing surface is available.
Emergency Water Landing — Power On
- Descend to hover above water
- Unlatch doors
- Passengers exit aircraft
- Fly to safe distance from passengers to avoid possible injury by rotors
- Switch battery and generator OFF
- Close throttle
- Keep aircraft level and apply full collective as aircraft contacts water
- Apply lateral cyclic to stop rotors
- Release seat belt and quickly clear aircraft when rotors stop